High-level db interfaces here are not compatible with bob.bio.video

While database interfaces here return frame containers just like databases in bob.bio.video, the API is incompatible with bob.bio.video and the frame selector is hard coded inside database interfaces. For an example, see: https://gitlab.idiap.ch/bob/bob.pad.face/blob/b0a14393f109e8bc15928ade60b0614e34e4b73f/bob/pad/face/database/replay.py#L50 especially line 71.

The way it is written now, not only you cannot use bob.bio.video wrapper classes with the databases here but also they always return all the frames and leave no option to the user.

Again @mguenther would be the best person to explain this.